Well, bear in mind your milage may be differant, but the differance is roughly 2c in favor of the copper Cascade. The SS Cascade which is silver would offer a bit more yet (.5-1c), but at higher cost.
The very best block going is the SS Cascade.
With what dual Swifty 600s will cost ya, why not go for a MD20rlzt Iwaki pump? The Iwaki will take up less room than 2 Swiftys will, and it'll offer even more head rate + flow rate than the Swiftys can. And the price will be little differant.
The Iwaki will have a much higher power draw however, about 2X what the dual Swiftys would have. The Iwaki will give about 50% more flow rate and head compared to the dual Swiftys in return for the higher power draw.
Have you decided on a rad for this set up? GPU or NB blocks?
What are you planning on cooling with those dual pumps beyond the WW or Cascade?
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